Form #43343530
-34-
Mar 09
16.0)
VENTING
Failure to do so may result in death, serious injury, property damage or illness
from Carbon Monoxide poisoning.
Heaters installed in an unvented mode require a minimum ventilation flow of
4 CFM per 1,000 Btu/hr of total installed capacity.
In buildings with airborne contamination the heater must be installed with
fresh air for combustion.
CARBON MONOXIDE HAZARD
A.
BASIC FLUE VENTING — Venting must comply with the latest edition of the National Fuel Gas Code (ANSI
Z223.1-latest edition) or the authority having jurisdiction. Other venting references are in the equipment
volume of the ASHRAE Handbook.
Model
Heat
exchanger
length ft
Maximum vent length ft.
(4” diameter)
Maximum Fresh air
intake length ft
(4” diameter)
Max. combination of
fresh air and vent ft.
(4” diameter)
PTS/U
40/25
20
45 50 75
PTS/U
50/30
20
45 50 75
PTS/U
50/30
30
35 40 65
PTS/U
50/30
40
25 30 55
PTS/U
75/50
20
45 50 75
PTS/U
75/50
30
35 40 65
PTS/U
75/50
40
25 30 55
PTS/U
100/65
30
45 50 75
PTS/U
100/65
40
35 40 65
PTS/U
100/65
50
25 30 55
PTS/U
125/80
30
60 50 75
PTS/U
125/80
40
50 40 65
PTS/U
125/80
50
40 30 55
PTS/U
125/80
60
30 20 45
PTS/U
150/100
40
60 50 75
PTS/U
150/100
50
50 40 65
PTS/U
150/100
60
40 30 55
PTS/U
175/110
50
60 50 75
PTS/U
175/110
60
50 40 65
PTS/U
175/110
70
40 30 55
PTS/U
200/125
50
60 40 65
PTS/U
200/125
60
50 30 55
PTS/U
200/125
70
40 30 45
Vent lengths shown in the table are for horizontal and vertical venting. If a longer length of vertical or horizontal
venting is required contact the manufacturer for assistance with vent sizing.
